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/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
* Matt Turner <mattst88@gmail.com>
*
*/
#include "main/macros.h"
#include "main/streaming-load-memcpy.h"
#include <smmintrin.h>
/* Copies memory from src to dst, using SSE 4.1's MOVNTDQA to get streaming
* read performance from uncached memory.
*/
void
_mesa_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len)
{
char *restrict d = dst;
char *restrict s = src;
/* If dst and src are not co-aligned, fallback to memcpy(). */
if (((uintptr_t)d & 15) != ((uintptr_t)s & 15)) {
memcpy(d, s, len);
return;
}
/* memcpy() the misaligned header. At the end of this if block, <d> and <s>
* are aligned to a 16-byte boundary or <len> == 0.
*/
if ((uintptr_t)d & 15) {
uintptr_t bytes_before_alignment_boundary = 16 - ((uintptr_t)d & 15);
assert(bytes_before_alignment_boundary < 16);
memcpy(d, s, MIN2(bytes_before_alignment_boundary, len));
d = (char *)ALIGN((uintptr_t)d, 16);
s = (char *)ALIGN((uintptr_t)s, 16);
len -= MIN2(bytes_before_alignment_boundary, len);
}
if (len >= 64)
_mm_mfence();
while (len >= 64) {
__m128i *dst_cacheline = (__m128i *)d;
__m128i *src_cacheline = (__m128i *)s;
__m128i temp1 = _mm_stream_load_si128(src_cacheline + 0);
__m128i temp2 = _mm_stream_load_si128(src_cacheline + 1);
__m128i temp3 = _mm_stream_load_si128(src_cacheline + 2);
__m128i temp4 = _mm_stream_load_si128(src_cacheline + 3);
_mm_store_si128(dst_cacheline + 0, temp1);
_mm_store_si128(dst_cacheline + 1, temp2);
_mm_store_si128(dst_cacheline + 2, temp3);
_mm_store_si128(dst_cacheline + 3, temp4);
d += 64;
s += 64;
len -= 64;
}
/* memcpy() the tail. */
if (len) {
memcpy(d, s, len);
}
}
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